<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>引入生命周期</title>
  <!-- react核心库 -->
  <script src="../js/react.development.js"></script>
  <!-- react扩展库支持react操作DOM -->
  <script src="../js/react-dom.development.js"></script>
  <!-- 1.ES6转ES5；2.jsx转js -->
  <script src="../js/babel.min.js"></script>
  <!-- prop操作 -->
  <script src="../js/prop-types.js"></script>
</head>

<body>
  <div id="test"></div>
  <script type="text/babel">
    class Life extends React.Component {
      state = {
        time: null,
        opacity: 1
      }
      death = () => {
        ReactDOM.unmountComponentAtNode(document.getElementById('test'))
      }
      // 挂载完成
      componentDidMount() {
        this.time=setInterval(() => {
          let { opacity } = this.state
          opacity -= 0.1
          if (opacity <= 0) {
            opacity = 1
          }
          this.setState({ opacity })
        }, 200)
      }
      // 将要卸载
      componentWillUnmount(){
        clearInterval(this.time)
      }
      
      render() {
        return (
          <div>
            <h1 style={{ opacity: this.state.opacity }}>React学不会怎么办？</h1>
            <button onClick={this.death}>不活了</button>
          </div>
        )
      }
    }
    ReactDOM.render(<Life />, document.getElementById('test'))
  </script>
</body>

</html>